EP3006718A1 - Liquid atomisation device - Google Patents

Liquid atomisation device Download PDF

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Publication number
EP3006718A1
EP3006718A1 EP15188632.2A EP15188632A EP3006718A1 EP 3006718 A1 EP3006718 A1 EP 3006718A1 EP 15188632 A EP15188632 A EP 15188632A EP 3006718 A1 EP3006718 A1 EP 3006718A1
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EP
European Patent Office
Prior art keywords
needle
spray orifice
liquid
free end
excitation means
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Granted
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EP15188632.2A
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German (de)
French (fr)
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EP3006718B1 (en
Inventor
Laurent Levin
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Renault SAS
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Renault SAS
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/041—Injectors peculiar thereto having vibrating means for atomizing the fuel, e.g. with sonic or ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the present invention generally relates to the atomization of a liquid, that is to say the reduction of a liquid into a jet of fine droplets.
  • the invention finds a particularly advantageous application in the production of fuel injectors or foggers.
  • An " indirect injection” internal combustion engine is a heat engine in which the fuel injection is not done in the cylinders of the engine block, but upstream of them, in the inlet ducts of the engine block. air in the cylinders.
  • This type of engine is particularly used in electric vehicles equipped with heat engines having a simple function of range extender (better known by the term " range extender ").
  • the heat engine is coupled to an alternator that charges the main storage battery of the vehicle when the charge level of this battery is too low.
  • the motor is then always used at a quasi-stationary regime, in which its performance is optimal.
  • a fogger To manufacture a fogger, it is known to use a nozzle in which the water reaches a moderate pressure and which has at its end a membrane pierced with a plurality of orifices of small diameters. The membrane is then excited at an ultrasonic frequency so as to inject the water in the form of a cloud of fine droplets.
  • the present invention proposes a new atomization device, which can be used both in the form of a fuel injector and in the form of a misting device, and which does not have the aforementioned drawbacks of the state of the technical.
  • an atomization device as defined in the introduction, wherein said needle has an inner pipe which opens on its free end, and there is provided a gas inlet which communicates with said pipe interior.
  • the reciprocating movement (at a generally ultrasonic frequency) of the needle makes it possible to chop the jet of liquid so that this liquid is sprayed through the spray orifice under form of droplets. It is said that the liquid is nebulized. This step does not require strongly compressing the liquid upstream of the device, since the spray orifice used may have a large diameter.
  • the jet of nebulized liquid meets the jet of gas, which makes it possible to disperse the jet of nebulized liquid in the desired direction, at the desired speed. Fine droplets of liquid are said to be atomized.
  • FIG. 1 On the figure 1 , there is shown a device 1 for atomizing liquid.
  • This atomizing device 1 may be used to provide a misting function, in which case this liquid will be water.
  • This atomizing device 1 may also be used to provide a fuel injector function, in which case this liquid will be fuel.
  • this atomizing device 1 mainly comprises a sheath (hereinafter called nozzle 2), a needle 10 mounted in the nozzle 2, means 20 for exciting the needle 10 and a liquid inlet 30.
  • the nozzle 2 has a bore 5 which opens at one end through a spray orifice 4. It is through this spray orifice 4 that the liquid will be ejected.
  • This end of the nozzle 2 will be called the front end. More generally, in the description, the terms “front” and “back” will be used with respect to the direction of ejection of the liquid, the front of an element designating the side of this element which is turned in the direction ejection and the rear designating the side of this element that is turned away.
  • the needle 10 and the nozzle 2 have such shapes that they define, around the free end 11 before the needle 10, a cavity 31 which communicates with the liquid inlet 30 and which therefore forms a reservoir of liquid.
  • the excitation means 20 are then provided to vibrate the needle 10 between its closed and open positions, so that the liquid contained in the cavity 31 can be regularly ejected from the atomizing device 1 through the Spray orifice 4.
  • the atomizing device 1 comprises a gas inlet 40 which communicates with an inner pipe 12 which passes through the needle 10 and which opens out on the free end 11 before the needle 10.
  • the gases arriving in the atomizing device 1 by the gas inlet 40 are then provided to rush into the inner pipe 12 in order to lead through the spray orifice 4.
  • these gases will divert the liquid particles ejected through the spray orifice 4, in the direction and at the desired speed.
  • the gas used will generally be compressed air.
  • the nozzle 2 has an outer cylindrical shape of revolution about a longitudinal axis A1.
  • Its bore 5 has a central portion 9 of cylindrical shape of revolution about the longitudinal axis A1.
  • the bore 5 On the side of the front end of the nozzle 2, the bore 5 has a front portion 6 whose section is gradually reduced to the spray orifice 4, so that the spray orifice 4 has a smaller diameter to that of the central portion 9 of the bore 5.
  • This front portion 6 has a frustoconical shape of revolution about the longitudinal axis A1. Its function is to provide a support abutment for the free end before 11 of the needle 10. It will henceforth be called seat 6.
  • the bore 5 On the side of the rear end of the nozzle 2, the bore 5 has a section enlargement 7 whose inner face is cylindrical in revolution about the longitudinal axis A1.
  • a ring 8 is mounted in force in this enlargement of section 7, which ensures its immobilization.
  • This ring 8 delimits a cylindrical inner duct of revolution about the longitudinal axis A1, through which is threaded the needle 10, of internal diameter equal to the diameter of the spray orifice 4.
  • the needle 10 is housed inside the bore 5 of the nozzle 2.
  • a central portion 13 is cylindrical of revolution about the longitudinal axis A1.
  • This central portion 13 of the needle 10 is extended at the rear by a frustoconical portion 15 whose section is gradually reduced, then by a cylindrical end portion 14 of revolution about the longitudinal axis A1.
  • the end portion 14 and the central portion 13 of the needle 10 respectively have a diameter equal to the operating clearance, to the inner diameter of the ring 8 and the central portion 9 of the bore 5, which ensures the sliding without play of the needle 10 in the nozzle 2.
  • the free end 11 before the needle 10 has a frustoconical shape of revolution about the longitudinal axis A1, which substantially matches the shape of the seat 6.
  • the needle 10 finally has, between its free end before 11 and its central portion 13, a hook which delimits with the bore 5 of the nozzle 2 the cavity 31 of liquid.
  • the frustoconical portion 15 of the needle 10 defines with the bore 5 a second cavity 32 which contains liquid.
  • This second cavity 32 communicates with the first cavity 31, for example via grooves provided in the outer face of the central portion 13 of the needle 10.
  • the liquid inlet 30 comprises a connection 33 which is fixed on the outer face of the nozzle 2 and which communicates with the second cavity 32 via a duct 34 which passes through the lateral wall of the nozzle 2.
  • the atomizing device 1 comprises a rear cover 3 which is fixed to the rear of the nozzle 2 and which delimits therewith a chamber 41 in which these excitation means 20 are housed.
  • this rear cover 3 has a tube shape open at a front end and closed at a rear end. It is fitted by its front end open on the nozzle 2, so as to be attached thereto in a sealed manner.
  • the excitation means 20 housed in the chamber 41 are then provided to axially vibrate the needle 10 at an ultrasonic frequency.
  • these excitation means 20 comprise for this purpose a support 21 and a piezoelectric transducer 22.
  • the support 21 has a central shaft 24 which is cylindrical of revolution about the longitudinal axis A1 and which is bordered at mid-length by a disc 25 in the form of flat disk and thin.
  • the piezoelectric transducer 22 is fixed to this ring 25, here on the rear face thereof. It presents for this purpose a flattened ring shape.
  • This piezoelectric transducer 22 is intended to be electrically controlled, between an inactive state in which it is not deformed, and an active state in which it periodically deforms at an ultrasonic frequency.
  • this piezoelectric transducer 22 makes it possible to bend the ring 25 periodically forwards and backwards, so that the excitation means 20 move back and forth along the axis longitudinal A1.
  • the front end of the central shaft 24 of the support 21 has a threaded bore 26 in which is screwed a threaded portion provided at the rear end of the needle 10.
  • return means 50 which automatically remind the needle 10 in the closed position when the excitation means 20 are inactive.
  • these return means are mechanical and are more precisely formed by a compression spring 50 which is interposed between the rear end of the central shaft 24 of the support 21 and the bottom of the rear cover 3.
  • the air inlet 40 has a connector 43 which is fixed through the side wall of the rear cover 3 and which thus communicates with the chamber 41.
  • the inner pipe 12, provided in the needle 10, here passes axially through the needle 10 along the longitudinal axis A1.
  • the central shaft 24 of the support 21 is also traversed axially by an inner pipe 23 which extends in the extension of the inner pipe 12 of the needle 10.
  • regulating means 42 for the flow of gas flowing through these inner conduits 12, 23.
  • These regulating means are here formed by a valve 42 placed on the coupling 43.
  • It may be a simple bistable valve 42, controlled between an open state in which the air flows in the atomizing device 1, and a closed state in which the air passage is blocked. This valve 42 can then be driven in the open state as soon as the excitation means 20 are activated.
  • a valve may be used to regulate the air flow more precisely.
  • the atomizing device 1 is shown in the open state.
  • the needle 10 which is in the open position is therefore located at a distance from its seat 6, which makes it possible to eject liquid through the spray orifice 4.
  • the atomizing device 1 is shown in the closed state.
  • the needle 10 which is in the closed position, is located against its seat 6, which makes it possible to block the ejection of liquid through the spray orifice 4.
  • a control unit applies electrical excitation to the piezoelectric transducer 22, which deforms and generates a movement of the needle 10 in a back and forth motion.
  • This back and forth is operated at a resonant frequency which will place the needle 10 and the support 21 in ultrasound levitation relative to the seat 6.
  • This displacement generates an alternation of openings and closures of the spray orifice 4 with ultrasonic frequency, which makes it possible to chop the jet of liquid and thus to nebulize the liquid as it leaves it through the spray orifice 4.
  • the drops of liquid which tend to converge are spaced apart so as to diverge at a desired speed and according to a desired dispersion cone (adjustable by modifying the air flow).
  • the inner pipe of the needle is bent, and opens not on the rear end of the needle but on the side thereof.
  • the excitation means are not piezoelectric but electromagnetic.
  • this atomization device could thus be used to manufacture a spray gun or a device for spreading and treating crops.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Special Spraying Apparatus (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Nozzles (AREA)

Abstract

L'invention concerne un dispositif d'atomisation (1) d'un liquide, comportant : - un fourreau (2) dont une extrémité présente un orifice de giclage (4), - une aiguille (10) qui présente une extrémité libre (11) tournée vers l'orifice de giclage et qui est montée mobile en translation dans le fourreau entre une position de fermeture et une position d'ouverture de l'orifice de giclage, - des moyens d'excitation (20) adaptés à faire vibrer l'aiguille entre ses positions de fermeture et d'ouverture, et - une arrivée de liquide (30). Selon l'invention, l'aiguille (10) présente une conduite intérieure (12) qui débouche sur son extrémité libre (11), et il est prévu une arrivée de gaz (40) qui communique avec ladite conduite intérieure (12).The invention relates to a device for atomizing (1) a liquid, comprising: a sheath (2), one end of which has a spray orifice (4), - a needle (10) which has a free end (11) facing the spray orifice and which is mounted to move in translation in the sleeve between a closed position and an opening position of the spray orifice, - excitation means (20) adapted to vibrate the needle between its closed and open positions, and - A liquid inlet (30). According to the invention, the needle (10) has an inner pipe (12) which opens on its free end (11), and there is provided a gas inlet (40) which communicates with said inner pipe (12).

Description

La présente invention concerne de manière générale l'atomisation d'un liquide, c'est-à-dire la réduction d'un liquide en un jet de fines gouttelettes.The present invention generally relates to the atomization of a liquid, that is to say the reduction of a liquid into a jet of fine droplets.

Elle concerne plus particulièrement un dispositif d'atomisation d'un liquide, comportant :

  • un fourreau dont une extrémité présente un orifice de giclage,
  • une aiguille qui présente une extrémité libre tournée vers l'orifice de giclage et qui est montée mobile en translation dans le fourreau entre une position de fermeture dans laquelle son extrémité libre obture l'orifice de giclage et une position d'ouverture dans laquelle son extrémité libre libère l'orifice de giclage,
  • des moyens d'excitation adaptés à faire vibrer l'aiguille entre ses positions de fermeture et d'ouverture, et
  • une arrivée de liquide qui communique avec une cavité située autour de l'extrémité libre de l'aiguille.
It relates more particularly to a device for atomizing a liquid, comprising:
  • a sleeve whose one end has a spray orifice,
  • a needle which has a free end facing the spray orifice and which is mounted to move in translation in the sheath between a closed position in which its free end closes the spray orifice and an open position in which its end free releases the spray orifice,
  • excitation means adapted to vibrate the needle between its closed and open positions, and
  • a liquid inlet which communicates with a cavity located around the free end of the needle.

L'invention trouve une application particulièrement avantageuse dans la réalisation d'injecteurs de carburant ou de brumisateurs.The invention finds a particularly advantageous application in the production of fuel injectors or foggers.

ARRIERE-PLAN TECHNOLOGIQUEBACKGROUND

Un moteur à combustion interne dit « à injection indirecte » est un moteur thermique dans lequel l'injection de carburant se fait non pas dans les cylindres du bloc-moteur, mais en amont de ceux-ci, dans les conduits d'arrivée d'air dans les cylindres.An " indirect injection " internal combustion engine is a heat engine in which the fuel injection is not done in the cylinders of the engine block, but upstream of them, in the inlet ducts of the engine block. air in the cylinders.

On utilise notamment ce type de moteurs dans les véhicules électriques équipés de moteurs thermiques ayant une simple fonction de prolongateur d'autonomie (plus connus sous l'expression anglaise de « range extender »).This type of engine is particularly used in electric vehicles equipped with heat engines having a simple function of range extender (better known by the term " range extender ").

Dans ces véhicules électriques, le moteur thermique est accouplé à un alternateur qui permet de charger la batterie d'accumulateurs principale du véhicule lorsque le niveau de charge de cette batterie est trop faible.In these electric vehicles, the heat engine is coupled to an alternator that charges the main storage battery of the vehicle when the charge level of this battery is too low.

Le moteur est alors toujours utilisé à un régime quasi-stationnaire, dans lequel son rendement est optimal.The motor is then always used at a quasi-stationary regime, in which its performance is optimal.

Pour une telle application, on souhaite injecter le carburant dans les conduits d'arrivée d'air sous forme de fines gouttelettes, à une pression modérée (de l'ordre de 3 bars), de manière à éviter de projeter le carburant sur les parois des conduits d'arrivée d'air (ce qui empêcherait une bonne homogénéisation du carburant avec l'air).For such an application, it is desired to inject the fuel into the air intake ducts in the form of fine droplets, at a moderate pressure (of the order of 3 bar), so as to avoid throwing the fuel on the walls. air intake ducts (which would prevent a good homogenization of the fuel with the air).

Afin d'obtenir un tel jet de carburant, il est connu d'utiliser un dispositif d'atomisation tel que précité, dont le fourreau présente à son extrémité une membrane percée d'une pluralité d'orifices de très petits diamètres (typiquement de 20 micromètres de diamètre). Un tel dispositif nécessite toutefois de comprimer fortement le carburant (à environ 10 bars) de manière à ce que ce dernier puisse traverser les orifices.In order to obtain such a fuel jet, it is known to use an atomization device as mentioned above, whose sheath has at its end a membrane pierced with a plurality of orifices of very small diameters (typically micrometers in diameter). Such a device, however, requires strongly compressing the fuel (at about 10 bar) so that the latter can pass through the orifices.

L'inconvénient de cette solution est donc qu'elle nécessite une pompe onéreuse pour comprimer le carburant à la pression souhaitée. L'utilisation d'une telle pompe accroît en outre la consommation en carburant du moteur thermique.The disadvantage of this solution is that it requires an expensive pump to compress the fuel to the desired pressure. The use of such a pump further increases the fuel consumption of the engine.

Pour fabriquer un brumisateur, il est connu d'utiliser une buse dans laquelle l'eau arrive à une pression modérée et qui présente à son extrémité une membrane percée d'une pluralité d'orifices de petits diamètres. La membrane est alors excitée à une fréquence ultrasonore de manière à injecter l'eau sous forme d'un nuage de fines gouttelettes.To manufacture a fogger, it is known to use a nozzle in which the water reaches a moderate pressure and which has at its end a membrane pierced with a plurality of orifices of small diameters. The membrane is then excited at an ultrasonic frequency so as to inject the water in the form of a cloud of fine droplets.

L'inconvénient de cette solution est qu'à l'arrêt, l'eau reste au contact de l'air au niveau des orifices, ce qui peut générer une contamination microbienne. En outre, l'eau étant sous pression dans la buse, on observe à l'arrêt des suintements d'eau au niveau des orifices.The disadvantage of this solution is that when stopped, the water remains in contact with the air at the orifices, which can generate microbial contamination. In addition, the water being under pressure in the nozzle, there is observed at the stop seepage of water at the orifices.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

La présente invention propose alors un nouveau dispositif d'atomisation, qui peut aussi bien être utilisé sous la forme d'un injecteur de carburant que sous la forme d'un brumisateur, et qui ne présente pas les inconvénients précités de l'état de la technique.The present invention then proposes a new atomization device, which can be used both in the form of a fuel injector and in the form of a misting device, and which does not have the aforementioned drawbacks of the state of the technical.

Plus particulièrement, on propose selon l'invention un dispositif d'atomisation tel que défini dans l'introduction, dans lequel ladite aiguille présente une conduite intérieure qui débouche sur son extrémité libre, et il est prévu une arrivée de gaz qui communique avec ladite conduite intérieure.More particularly, it is proposed according to the invention an atomization device as defined in the introduction, wherein said needle has an inner pipe which opens on its free end, and there is provided a gas inlet which communicates with said pipe interior.

Ainsi, grâce à l'invention, le mouvement de va-et-vient (à une fréquence généralement ultrasonore) de l'aiguille permet de hacher le jet de liquide de manière que ce liquide est pulvérisé au travers de l'orifice de giclage sous forme de gouttelettes. On dit alors du liquide qu'il est nébulisé. Cette étape ne nécessite pas de comprimer fortement le liquide en amont du dispositif, puisque l'orifice de giclage utilisé peut présenter un diamètre important.Thus, thanks to the invention, the reciprocating movement (at a generally ultrasonic frequency) of the needle makes it possible to chop the jet of liquid so that this liquid is sprayed through the spray orifice under form of droplets. It is said that the liquid is nebulized. This step does not require strongly compressing the liquid upstream of the device, since the spray orifice used may have a large diameter.

A sa sortie de l'orifice de giclage, le jet de liquide nébulisé rencontre le jet de gaz, ce qui permet de disperser le jet de liquide nébulisé dans la direction souhaitée, à la vitesse désirée. On dit alors des fines gouttelettes de liquide qu'elles sont atomisées.At its exit from the spray orifice, the jet of nebulized liquid meets the jet of gas, which makes it possible to disperse the jet of nebulized liquid in the desired direction, at the desired speed. Fine droplets of liquid are said to be atomized.

D'autres caractéristiques avantageuses et non limitatives du dispositif d'atomisation conforme à l'invention sont les suivantes :

  • ledit fourreau présente un unique orifice de giclage ;
  • lesdits moyens d'excitation sont adaptés à faire vibrer axialement ladite aiguille à une fréquence propre ultrasonore ,
  • lesdits moyens d'excitation comportent un transducteur piézoélectrique ;
  • ladite conduite intérieure traverse axialement l'aiguille ;
  • il est prévu un capot arrière qui est fixé audit fourreau de manière à délimiter avec celui-ci une cavité dans laquelle sont logés les moyens d'excitation ;
  • ladite conduite intérieure communique avec ladite cavité, au moyen d'un conduit qui traverse axialement les moyens d'excitation ;
  • il est prévu des moyens de régulation du débit de gaz circulant au travers de ladite arrivée de gaz ;
  • lesdits moyens de régulation et lesdits moyens d'excitation sont cadencés de manière à ce que les injections de gaz et de liquide soient en phase ; et
  • il est prévu des moyens de rappel de l'aiguille en position de fermeture, qui sont distincts desdits moyens d'excitation.
Other advantageous and non-limiting characteristics of the atomization device according to the invention are the following:
  • said sheath has a single spray orifice;
  • said excitation means are adapted to axially vibrate said needle at an ultrasonic natural frequency,
  • said excitation means comprise a piezoelectric transducer;
  • said inner pipe axially passes through the needle;
  • there is provided a rear cover which is fixed to said sheath so as to define therewith a cavity in which the excitation means are housed;
  • said inner pipe communicates with said cavity, by means of a conduit which passes axially through the excitation means;
  • there is provided means for regulating the flow of gas flowing through said gas inlet;
  • said regulating means and said energizing means are clocked so that the gas and liquid injections are in phase; and
  • there are provided means for returning the needle in the closed position, which are distinct from said excitation means.

DESCRIPTION DETAILLEE D'UN EXEMPLE DE REALISATIONDETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT

La description qui va suivre en regard des dessins annexés, donnés à titre d'exemples non limitatifs, fera bien comprendre en quoi consiste l'invention et comment elle peut être réalisée.The following description with reference to the accompanying drawings, given as non-limiting examples, will make it clear what the invention consists of and how it can be achieved.

Sur les dessins annexés :

  • la figure 1 est une vue schématique en coupe d'un dispositif d'atomisation selon l'invention ;
  • la figure 2 est une vue schématique en coupe du dispositif d'atomisation de la figure 1, représenté en position d'ouverture ;
  • la figure 3 est une vue schématique en coupe du dispositif d'atomisation de la figure 1, représenté en position de fermeture.
In the accompanying drawings:
  • the figure 1 is a schematic sectional view of an atomization device according to the invention;
  • the figure 2 is a schematic sectional view of the atomization device of the figure 1 , shown in the open position;
  • the figure 3 is a schematic sectional view of the atomization device of the figure 1 , shown in the closed position.

Sur la figure 1, on a représenté un dispositif d'atomisation 1 de liquide.On the figure 1 , there is shown a device 1 for atomizing liquid.

Ce dispositif d'atomisation 1 pourra être utilisé pour assurer une fonction de brumisateur, auquel cas ce liquide sera de l'eau.This atomizing device 1 may be used to provide a misting function, in which case this liquid will be water.

Ce dispositif d'atomisation 1 pourra également être utilisé pour assurer une fonction d'injecteur de carburant, auquel cas ce liquide sera du carburant.This atomizing device 1 may also be used to provide a fuel injector function, in which case this liquid will be fuel.

Quelle que soit sa fonction, ce dispositif d'atomisation 1 comporte principalement un fourreau (ci-après appelé buse 2), une aiguille 10 montée dans la buse 2, des moyens d'excitation 20 de l'aiguille 10 et une arrivée de liquide 30.Whatever its function, this atomizing device 1 mainly comprises a sheath (hereinafter called nozzle 2), a needle 10 mounted in the nozzle 2, means 20 for exciting the needle 10 and a liquid inlet 30.

La buse 2 présente un alésage 5 qui débouche à une extrémité par un orifice de giclage 4. C'est par cet orifice de giclage 4 que sera éjecté le liquide.The nozzle 2 has a bore 5 which opens at one end through a spray orifice 4. It is through this spray orifice 4 that the liquid will be ejected.

Cette extrémité de la buse 2 sera appelée extrémité avant. De manière plus générale, dans la description, les termes « avant » et « arrière » seront utilisés par rapport à la direction d'éjection du liquide, l'avant d'un élément désignant le côté de cet élément qui est tourné dans la direction d'éjection et l'arrière désignant le côté de cet élément qui est tourné à l'opposé.This end of the nozzle 2 will be called the front end. More generally, in the description, the terms "front" and "back" will be used with respect to the direction of ejection of the liquid, the front of an element designating the side of this element which is turned in the direction ejection and the rear designating the side of this element that is turned away.

L'aiguille 10 est montée coulissante dans l'alésage 5, entre :

  • une position de fermeture dans laquelle son extrémité libre avant 11 obture l'orifice de giclage 4, et
  • une position d'ouverture dans laquelle son extrémité libre avant 11 libère l'orifice de giclage 4, ce qui permet au liquide de sortir du dispositif d'atomisation 1.
The needle 10 is slidably mounted in the bore 5, between:
  • a closed position in which its free end before 11 closes the spray orifice 4, and
  • an open position in which its free end before 11 releases the spray orifice 4, which allows the liquid to exit the atomizing device 1.

L'aiguille 10 et la buse 2 présentent des formes telles qu'elles délimitent, autour de l'extrémité libre avant 11 de l'aiguille 10, une cavité 31 qui communique avec l'arrivée de liquide 30 et qui forme donc un réservoir de liquide.The needle 10 and the nozzle 2 have such shapes that they define, around the free end 11 before the needle 10, a cavity 31 which communicates with the liquid inlet 30 and which therefore forms a reservoir of liquid.

Les moyens d'excitation 20 sont alors prévus pour faire vibrer l'aiguille 10 entre ses positions de fermeture et d'ouverture, de manière que le liquide contenu dans la cavité 31 puisse être régulièrement éjecté du dispositif d'atomisation 1 au travers de l'orifice de giclage 4.The excitation means 20 are then provided to vibrate the needle 10 between its closed and open positions, so that the liquid contained in the cavity 31 can be regularly ejected from the atomizing device 1 through the Spray orifice 4.

Selon une caractéristique particulièrement avantageuse de l'invention, le dispositif d'atomisation 1 comporte une arrivée de gaz 40 qui communique avec une conduite intérieure 12 qui traverse l'aiguille 10 et qui débouche sur l'extrémité libre avant 11 de cette aiguille 10.According to a particularly advantageous characteristic of the invention, the atomizing device 1 comprises a gas inlet 40 which communicates with an inner pipe 12 which passes through the needle 10 and which opens out on the free end 11 before the needle 10.

Les gaz arrivant dans le dispositif d'atomisation 1 par l'arrivée de gaz 40 sont alors prévus pour s'engouffrer dans la conduite intérieure 12 afin de déboucher au travers de l'orifice de giclage 4.The gases arriving in the atomizing device 1 by the gas inlet 40 are then provided to rush into the inner pipe 12 in order to lead through the spray orifice 4.

Comme cela sera décrit plus en détail dans la suite de cet exposé, ces gaz permettront de dévier les particules de liquide éjectées au travers de l'orifice de giclage 4, dans la direction et à la vitesse souhaitées.As will be described in more detail later in this discussion, these gases will divert the liquid particles ejected through the spray orifice 4, in the direction and at the desired speed.

Le gaz utilisé sera généralement de l'air comprimé.The gas used will generally be compressed air.

Dans le mode de réalisation représenté sur la figure 1, la buse 2 présente une forme extérieure cylindrique de révolution autour d'un axe longitudinal A1.In the embodiment shown on the figure 1 , the nozzle 2 has an outer cylindrical shape of revolution about a longitudinal axis A1.

Elle présente à son extrémité avant un unique orifice de giclage 4.It has at its front end a single spray orifice 4.

Son alésage 5 présente une partie centrale 9 de forme cylindrique de révolution autour de l'axe longitudinal A1.Its bore 5 has a central portion 9 of cylindrical shape of revolution about the longitudinal axis A1.

Du côté de l'extrémité avant de la buse 2, l'alésage 5 présente une partie avant 6 dont la section se réduit progressivement jusqu'à l'orifice de giclage 4, si bien que l'orifice de giclage 4 présente un diamètre inférieur à celui de la partie centrale 9 de l'alésage 5. Cette partie avant 6 présente une forme tronconique de révolution autour de l'axe longitudinal A1. Elle a pour fonction d'assurer une butée d'appui pour l'extrémité libre avant 11 de l'aiguille 10. Elle sera donc ci-après nommée siège 6.On the side of the front end of the nozzle 2, the bore 5 has a front portion 6 whose section is gradually reduced to the spray orifice 4, so that the spray orifice 4 has a smaller diameter to that of the central portion 9 of the bore 5. This front portion 6 has a frustoconical shape of revolution about the longitudinal axis A1. Its function is to provide a support abutment for the free end before 11 of the needle 10. It will henceforth be called seat 6.

En position de fermeture, l'extrémité libre avant 11 de l'aiguille 10 repose alors sur ce siège 6, ce qui assure l'étanchéité entre l'aiguille 10 et la buse 2 au niveau de l'orifice de giclage 4.In the closed position, the free front end 11 of the needle 10 then rests on this seat 6, which ensures the seal between the needle 10 and the nozzle 2 at the spray orifice 4.

En position d'ouverture, l'extrémité libre avant 11 de l'aiguille 10 se place à distance de ce siège 6, ce qui permet l'éjection de liquide au travers de l'orifice de giclage 4.In the open position, the free end 11 before the needle 10 is placed at a distance from this seat 6, which allows the ejection of liquid through the spray orifice 4.

Du côté de l'extrémité arrière de la buse 2, l'alésage 5 présente un élargissement de section 7 dont la face intérieure est cylindrique de révolution autour de l'axe longitudinal A1. Une bague 8 est montée en force dans cet élargissement de section 7, ce qui assure son immobilisation. Cette bague 8 délimite un conduit intérieur cylindrique de révolution autour de l'axe longitudinal A1, au travers duquel est enfilée l'aiguille 10, de diamètre intérieur égal au diamètre de l'orifice de giclage 4.On the side of the rear end of the nozzle 2, the bore 5 has a section enlargement 7 whose inner face is cylindrical in revolution about the longitudinal axis A1. A ring 8 is mounted in force in this enlargement of section 7, which ensures its immobilization. This ring 8 delimits a cylindrical inner duct of revolution about the longitudinal axis A1, through which is threaded the needle 10, of internal diameter equal to the diameter of the spray orifice 4.

Comme le montre la figure 1, l'aiguille 10 est logée à l'intérieur de l'alésage 5 de la buse 2.As shown in figure 1 , the needle 10 is housed inside the bore 5 of the nozzle 2.

Elle présente à cet effet une forme de tige, dont une partie centrale 13 est cylindrique de révolution autour de l'axe longitudinal A1.It has for this purpose a rod shape, a central portion 13 is cylindrical of revolution about the longitudinal axis A1.

Cette partie centrale 13 de l'aiguille 10 se prolonge à l'arrière par une partie tronconique 15 dont la section se réduit progressivement, puis par une partie d'extrémité 14 cylindrique de révolution autour de l'axe longitudinal A1.This central portion 13 of the needle 10 is extended at the rear by a frustoconical portion 15 whose section is gradually reduced, then by a cylindrical end portion 14 of revolution about the longitudinal axis A1.

La partie d'extrémité 14 et la partie centrale 13 de l'aiguille 10 présentent respectivement un diamètre égal, au jeu de fonctionnement près, au diamètre intérieur de la bague 8 et de la partie centrale 9 de l'alésage 5, ce qui assure le coulissement sans jeu de l'aiguille 10 dans la buse 2.The end portion 14 and the central portion 13 of the needle 10 respectively have a diameter equal to the operating clearance, to the inner diameter of the ring 8 and the central portion 9 of the bore 5, which ensures the sliding without play of the needle 10 in the nozzle 2.

L'extrémité libre avant 11 de l'aiguille 10 présente quant à elle une forme tronconique de révolution autour de l'axe longitudinal A1, qui épouse sensiblement la forme du siège 6.The free end 11 before the needle 10 has a frustoconical shape of revolution about the longitudinal axis A1, which substantially matches the shape of the seat 6.

L'aiguille 10 présente enfin, entre son extrémité libre avant 11 et sa partie centrale 13, un décroché qui délimite avec l'alésage 5 de la buse 2 la cavité 31 de liquide.The needle 10 finally has, between its free end before 11 and its central portion 13, a hook which delimits with the bore 5 of the nozzle 2 the cavity 31 of liquid.

La partie tronconique 15 de l'aiguille 10 définit quant à elle avec l'alésage 5 une seconde cavité 32 qui renferme du liquide. Cette seconde cavité 32 communique avec la première cavité 31, par exemple via des rainures prévues en creux dans la face externe de la partie centrale 13 de l'aiguille 10.The frustoconical portion 15 of the needle 10 defines with the bore 5 a second cavity 32 which contains liquid. This second cavity 32 communicates with the first cavity 31, for example via grooves provided in the outer face of the central portion 13 of the needle 10.

Ici, comme le montre la figure 1, l'arrivée de liquide 30 comporte un raccord 33 qui est fixé sur la face externe de la buse 2 et qui communique avec la seconde cavité 32, via un conduit 34 qui traverse la paroi latérale de la buse 2.Here, as shown in figure 1 , the liquid inlet 30 comprises a connection 33 which is fixed on the outer face of the nozzle 2 and which communicates with the second cavity 32 via a duct 34 which passes through the lateral wall of the nozzle 2.

Puisque les diamètres intérieurs de la bague 8 et de l'orifice de giclage 4 sont égaux, les efforts exercés par le liquide sous pression sur l'aiguille 10 se compensent. On dit alors de l'aiguille 10 qu'elle est en équilibre hydrostatique quelle que soit la pression d'alimentation du liquide.Since the inner diameters of the ring 8 and the spray orifice 4 are equal, the forces exerted by the pressurized liquid on the needle 10 compensate each other. The needle 10 is then said to be in hydrostatic equilibrium regardless of the supply pressure of the liquid.

Ce sont donc bien les moyens d'excitation 20 qui vont commander le déplacement de l'aiguille 10.It is therefore the excitation means 20 which will control the movement of the needle 10.

Dans le mode de réalisation représenté sur la figure 1, le dispositif d'atomisation 1 comporte un capot arrière 3 qui est fixé à l'arrière de la buse 2 et qui délimite avec celle-ci une chambre 41 dans laquelle sont logés ces moyens d'excitation 20.In the embodiment shown on the figure 1 , the atomizing device 1 comprises a rear cover 3 which is fixed to the rear of the nozzle 2 and which delimits therewith a chamber 41 in which these excitation means 20 are housed.

Ici, ce capot arrière 3 présente une forme de tube ouvert à une extrémité avant et fermé à une extrémité arrière. Il est emmanché par son extrémité avant ouverte sur la buse 2, de manière à être fixé à celle-ci de manière étanche.Here, this rear cover 3 has a tube shape open at a front end and closed at a rear end. It is fitted by its front end open on the nozzle 2, so as to be attached thereto in a sealed manner.

Les moyens d'excitation 20 logés dans la chambre 41 sont alors prévus pour faire vibrer axialement l'aiguille 10 à une fréquence propre ultrasonore.The excitation means 20 housed in the chamber 41 are then provided to axially vibrate the needle 10 at an ultrasonic frequency.

Ici, ces moyens d'excitation 20 comportent à cet effet un support 21 et un transducteur piézoélectrique 22.Here, these excitation means 20 comprise for this purpose a support 21 and a piezoelectric transducer 22.

Le support 21 présente un arbre central 24 qui est cylindrique de révolution autour de l'axe longitudinal A1 et qui est bordé à mi-longueur par une couronne 25 en forme de disque plat et peu épais.The support 21 has a central shaft 24 which is cylindrical of revolution about the longitudinal axis A1 and which is bordered at mid-length by a disc 25 in the form of flat disk and thin.

Le transducteur piézoélectrique 22 est fixé à cette couronne 25, ici sur la face arrière de celle-ci. Il présente à cet effet une forme d'anneau aplati.The piezoelectric transducer 22 is fixed to this ring 25, here on the rear face thereof. It presents for this purpose a flattened ring shape.

Ce transducteur piézoélectrique 22 est prévu pour être piloté électriquement, entre un état inactif dans lequel il ne se déforme pas, et un état actif dans lequel il se déforme périodiquement, à une fréquence ultrasonore.This piezoelectric transducer 22 is intended to be electrically controlled, between an inactive state in which it is not deformed, and an active state in which it periodically deforms at an ultrasonic frequency.

Comme le montrent bien les figures 2 et 3, l'activation de ce transducteur piézoélectrique 22 permet alors de faire fléchir la couronne 25 périodiquement vers l'avant et vers l'arrière, de manière que les moyens d'excitation 20 présentent un mouvement de va-et-vient selon l'axe longitudinal A1.As the Figures 2 and 3 , the activation of this piezoelectric transducer 22 then makes it possible to bend the ring 25 periodically forwards and backwards, so that the excitation means 20 move back and forth along the axis longitudinal A1.

Comme le montre la figure 1, pour transmettre ce mouvement de va-et-vient à l'aiguille 11, l'extrémité avant de l'arbre central 24 du support 21 présente un alésage taraudé 26 dans lequel est vissée une partie filetée prévue à l'extrémité arrière de l'aiguille 10.As shown in figure 1 , to transmit this movement back and forth to the needle 11, the front end of the central shaft 24 of the support 21 has a threaded bore 26 in which is screwed a threaded portion provided at the rear end of the needle 10.

Préférentiellement, il est prévu des moyens de rappel 50 qui permettent de rappeler automatiquement l'aiguille 10 en position de fermeture lorsque les moyens d'excitation 20 sont inactifs.Preferably, there are provided return means 50 which automatically remind the needle 10 in the closed position when the excitation means 20 are inactive.

Ici, ces moyens de rappel sont mécaniques et sont plus précisément formés par un ressort de compression 50 qui s'interpose entre l'extrémité arrière de l'arbre central 24 du support 21 et le fond du capot arrière 3.Here, these return means are mechanical and are more precisely formed by a compression spring 50 which is interposed between the rear end of the central shaft 24 of the support 21 and the bottom of the rear cover 3.

Comme le montre la figure 1, l'arrivée d'air 40 comporte un raccord 43 qui est fixé au travers de la paroi latérale du capot arrière 3 et qui communique ainsi avec la chambre 41.As shown in figure 1 , the air inlet 40 has a connector 43 which is fixed through the side wall of the rear cover 3 and which thus communicates with the chamber 41.

La conduite intérieure 12, prévue dans l'aiguille 10, traverse ici axialement l'aiguille 10, selon l'axe longitudinal A1.The inner pipe 12, provided in the needle 10, here passes axially through the needle 10 along the longitudinal axis A1.

De manière que cette conduite intérieure 12 puisse communiquer avec la chambre 41, l'arbre central 24 du support 21 est également traversé axialement par une conduite intérieure 23 qui s'étend dans le prolongement de la conduite intérieure 12 de l'aiguille 10.So that this inner pipe 12 can communicate with the chamber 41, the central shaft 24 of the support 21 is also traversed axially by an inner pipe 23 which extends in the extension of the inner pipe 12 of the needle 10.

Préférentiellement, il est prévu des moyens de régulation 42 du débit de gaz circulant au travers de ces conduites intérieures 12, 23. Ces moyens de régulation sont ici formés par une vanne 42 placée sur le raccord 43.Preferably, there are provided regulating means 42 for the flow of gas flowing through these inner conduits 12, 23. These regulating means are here formed by a valve 42 placed on the coupling 43.

Il pourra s'agir d'une simple vanne 42 bistable, pilotée entre un état ouvert dans lequel l'air circule dans le dispositif d'atomisation 1, et un état fermé dans lequel le passage d'air est bloqué. Cette vanne 42 pourra alors être pilotée à l'état ouvert dès que les moyens d'excitation 20 seront activés.It may be a simple bistable valve 42, controlled between an open state in which the air flows in the atomizing device 1, and a closed state in which the air passage is blocked. This valve 42 can then be driven in the open state as soon as the excitation means 20 are activated.

En variante, on pourra prévoir de cadencer les moyens de régulation 42 et les moyens d'excitation 20 de manière à ce que les injections d'air soient en phase avec les injections de liquide.Alternatively, it can be provided to clock the control means 42 and the excitation means 20 so that the air injections are in phase with the liquid injections.

Encore en variante, on pourra utiliser une vanne permettant de réguler de manière plus précise le débit d'air.In another variant, a valve may be used to regulate the air flow more precisely.

Sur la figure 2, on a représenté le dispositif d'atomisation 1 à l'état ouvert. Dans cet état, l'aiguille 10 qui est en position d'ouverture est donc située à distance de son siège 6, ce qui permet d'éjecter du liquide au travers de l'orifice de giclage 4.On the figure 2 , the atomizing device 1 is shown in the open state. In this state, the needle 10 which is in the open position is therefore located at a distance from its seat 6, which makes it possible to eject liquid through the spray orifice 4.

Sur la figure 3, on a représenté le dispositif d'atomisation 1 à l'état fermé. Dans cet état, l'aiguille 10 qui est en position de fermeture, est située contre son siège 6, ce qui permet de bloquer l'éjection de liquide au travers de l'orifice de giclage 4.On the figure 3 , the atomizing device 1 is shown in the closed state. In this state, the needle 10 which is in the closed position, is located against its seat 6, which makes it possible to block the ejection of liquid through the spray orifice 4.

Pour passer d'une position à l'autre, une unité de pilotage applique une excitation électrique sur le transducteur piézoélectrique 22, qui se déforme et génère un déplacement de l'aiguille 10 selon un mouvement de va-et-vient. Ce va-et-vient est opéré à une fréquence de résonance qui va placer l'aiguille 10 et le support 21 en lévitation ultrasonore par rapport au siège 6.To move from one position to another, a control unit applies electrical excitation to the piezoelectric transducer 22, which deforms and generates a movement of the needle 10 in a back and forth motion. This back and forth is operated at a resonant frequency which will place the needle 10 and the support 21 in ultrasound levitation relative to the seat 6.

Ce déplacement génère une alternance d'ouvertures et de fermetures de l'orifice de giclage 4 à fréquence ultrasonore, ce qui permet de hacher le jet de liquide et donc de nébuliser le liquide dès sa sortie par l'orifice de giclage 4.This displacement generates an alternation of openings and closures of the spray orifice 4 with ultrasonic frequency, which makes it possible to chop the jet of liquid and thus to nebulize the liquid as it leaves it through the spray orifice 4.

Comme le montrent les traits T1 en pointillés sur la figure 2, en l'absence de flux d'air provenant du conduit intérieur 12, les gouttes de liquide convergeraient, se percuteraient, voire fusionneraient, puis se disperseraient de nouveau selon un mode complexe non souhaité.As shown by the dotted lines T1 on the figure 2 in the absence of air flow from the inner conduit 12, the drops of liquid would converge, collide, or merge, and then disperse again in an undesired complex mode.

Comme le montrent les traits T2 en pointillés sur la figure 2, grâce au flux d'air provenant du conduit intérieur 12, les gouttes de liquide qui ont tendance à converger sont écartées de manière à diverger à une vitesse souhaitée et selon un cône de dispersion souhaité (réglables en modifiant le débit d'air).As shown by the dotted T2 lines on the figure 2 thanks to the air flow coming from the inner duct 12, the drops of liquid which tend to converge are spaced apart so as to diverge at a desired speed and according to a desired dispersion cone (adjustable by modifying the air flow).

Ainsi aucun croisement entre jets de liquide n'apparaît, et l'interaction des gouttes de liquide avec le flux d'air induit une atomisation secondaire des gouttes éjectées.Thus no crossing between jets of liquid appears, and the interaction of the drops of liquid with the air flow induces a secondary atomization of ejected drops.

La présente invention n'est nullement limitée au mode de réalisation décrit et représenté, mais l'homme du métier saura y apporter toute variante conforme à son esprit.The present invention is not limited to the embodiment described and shown, but the art can apply any variant within his mind.

On pourrait ainsi prévoir que la conduite intérieure de l'aiguille soit coudée, et débouche non pas sur l'extrémité arrière de l'aiguille mais sur le côté de celle-ci.It could thus be provided that the inner pipe of the needle is bent, and opens not on the rear end of the needle but on the side thereof.

On pourrait aussi prévoir que les moyens d'excitation soient non pas piézoélectriques mais électromagnétiques.It could also be provided that the excitation means are not piezoelectric but electromagnetic.

On pourrait par ailleurs prévoir de placer le dispositif d'atomisation dans la ligne d'échappement d'un moteur à combustion interne, par exemple pour disperser un produit réducteur dans les gaz brûlés.One could also provide to place the atomizing device in the exhaust line of an internal combustion engine, for example to disperse a reducing product in the flue gas.

D'autres applications de ce dispositif d'atomisation sont également envisageables. A titre d'exemples, un tel dispositif pourrait ainsi être utilisé pour fabriquer un pistolet à peinture ou un dispositif d'épandage et de traitement des cultures.Other applications of this atomization device are also conceivable. By way of examples, such a device could thus be used to manufacture a spray gun or a device for spreading and treating crops.

Claims (10)

Dispositif d'atomisation (1) d'un liquide, comportant : - un fourreau (2) dont une extrémité présente un orifice de giclage (4), - une aiguille (10) qui présente une extrémité libre (11) tournée vers l'orifice de giclage (4) et qui est montée mobile en translation dans le fourreau (2) entre une position de fermeture dans laquelle son extrémité libre (11) obture l'orifice de giclage (4) et une position d'ouverture dans laquelle son extrémité libre (11) libère l'orifice de giclage (4), - des moyens d'excitation (20) adaptés à faire vibrer l'aiguille (10) entre ses positions de fermeture et d'ouverture, et - une arrivée de liquide (30) qui communique avec une cavité (31) située autour de l'extrémité libre (11) de l'aiguille (10),
caractérisé en ce que ladite aiguille (10) présente une conduite intérieure (12) qui débouche sur son extrémité libre (11), et
en ce qu'il est prévu une arrivée de gaz (40) qui communique avec ladite conduite intérieure (12). Device for atomizing (1) a liquid, comprising: a sheath (2), one end of which has a spray orifice (4), - a needle (10) which has a free end (11) facing the spray orifice (4) and which is mounted to move in translation in the sleeve (2) between a closed position in which its free end (11) closes the spray orifice (4) and an open position in which its free end (11) releases the spray orifice (4), - excitation means (20) adapted to vibrate the needle (10) between its closed and open positions, and a liquid inlet (30) which communicates with a cavity (31) situated around the free end (11) of the needle (10),
characterized in that said needle (10) has an inner pipe (12) which opens on its free end (11), and
in that a gas inlet (40) is provided which communicates with said inner pipe (12). Dispositif d'atomisation (1) selon la revendication précédente, dans lequel ledit fourreau (2) présente un unique orifice de giclage (4).Spraying device (1) according to the preceding claim, wherein said sheath (2) has a single spray orifice (4). Dispositif d'atomisation (1) selon l'une des revendications précédentes, dans lequel lesdits moyens d'excitation (20) sont adaptés à faire vibrer axialement ladite aiguille (10) à une fréquence propre ultrasonore.Spraying device (1) according to one of the preceding claims, wherein said excitation means (20) are adapted to axially vibrate said needle (10) at an ultrasonic natural frequency. Dispositif d'atomisation (1) selon l'une des revendications précédentes, dans lequel lesdits moyens d'excitation (20) comportent un transducteur piézoélectrique (22).An atomizing device (1) according to one of the preceding claims, wherein said excitation means (20) comprises a piezoelectric transducer (22). Dispositif d'atomisation (1) selon l'une des revendications précédentes, dans lequel ladite conduite intérieure (12) traverse axialement l'aiguille (10).An atomizing device (1) according to one of the preceding claims, wherein said inner pipe (12) passes axially through the needle (10). Dispositif d'atomisation (1) selon l'une des revendications précédentes, dans lequel il est prévu un capot arrière (3) qui est fixé audit fourreau (2) de manière à délimiter avec celui-ci une cavité (41) dans laquelle sont logés les moyens d'excitation (20).Spraying device (1) according to one of the preceding claims, in which there is provided a rear cover (3) which is fixed to said sleeve (2) so as to define therewith a cavity (41) in which are accommodated the excitation means (20). Dispositif d'atomisation (1) selon la revendication précédente, dans lequel ladite conduite intérieure (12) communique avec ladite cavité (41), au moyen d'un conduit (23) qui traverse axialement les moyens d'excitation (20).Spray device (1) according to the preceding claim, wherein said inner pipe (12) communicates with said cavity (41), at means of a conduit (23) which passes axially through the excitation means (20). Dispositif d'atomisation (1) selon l'une des revendications précédentes, dans lequel il est prévu des moyens de régulation (42) du débit de gaz circulant au travers de ladite arrivée de gaz (40).Spraying device (1) according to one of the preceding claims, wherein there is provided regulating means (42) of the flow of gas flowing through said gas inlet (40). Dispositif d'atomisation (1) selon la revendication précédente, dans lequel lesdits moyens de régulation (42) et lesdits moyens d'excitation (20) sont cadencés de manière à ce que les injections de gaz et de liquide soient en phase.Spraying device (1) according to the preceding claim, wherein said regulating means (42) and said excitation means (20) are clocked so that the gas and liquid injections are in phase. Dispositif d'atomisation (1) selon l'une des revendications précédentes, dans lequel il est prévu des moyens de rappel (50) de l'aiguille (10) en position de fermeture, qui sont distincts desdits moyens d'excitation (20).Spraying device (1) according to one of the preceding claims, wherein there is provided return means (50) of the needle (10) in the closed position, which are distinct from said excitation means (20) .
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016206902A1 (en) * 2016-04-22 2017-10-26 Technische Universität Bergakademie Freiberg Device for modulating at least one liquid jet

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE787603A (en) * 1972-08-16 1973-02-16 Cottell Eric Ch METHOD AND APPARATUS FOR FORMING A MIXTURE OF FUEL AND AIR BY MEANS OF SONIC ENERGY.
JPS63270573A (en) * 1987-04-30 1988-11-08 Toa Nenryo Kogyo Kk Ultrasonic and supersonic air flow combined injection valve
JPS6438160A (en) * 1987-08-05 1989-02-08 Toa Nenryo Kogyo Kk Ultrasonic composite atomizer
JPH02259264A (en) * 1989-03-31 1990-10-22 Tonen Corp Fuel supply device with ultrasonic atomizer for gasoline engine
JPH0412158A (en) * 1990-04-28 1992-01-16 Tonen Corp Fuel supply device of spark ignition engine
WO2008000095A1 (en) * 2006-06-29 2008-01-03 The University Of British Columbia Concurrent injection of liquid and gaseous fuels in an engine
EP2060774A1 (en) * 2007-11-16 2009-05-20 Delphi Technologies, Inc. Fuel injector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE787603A (en) * 1972-08-16 1973-02-16 Cottell Eric Ch METHOD AND APPARATUS FOR FORMING A MIXTURE OF FUEL AND AIR BY MEANS OF SONIC ENERGY.
JPS63270573A (en) * 1987-04-30 1988-11-08 Toa Nenryo Kogyo Kk Ultrasonic and supersonic air flow combined injection valve
JPS6438160A (en) * 1987-08-05 1989-02-08 Toa Nenryo Kogyo Kk Ultrasonic composite atomizer
JPH02259264A (en) * 1989-03-31 1990-10-22 Tonen Corp Fuel supply device with ultrasonic atomizer for gasoline engine
JPH0412158A (en) * 1990-04-28 1992-01-16 Tonen Corp Fuel supply device of spark ignition engine
WO2008000095A1 (en) * 2006-06-29 2008-01-03 The University Of British Columbia Concurrent injection of liquid and gaseous fuels in an engine
EP2060774A1 (en) * 2007-11-16 2009-05-20 Delphi Technologies, Inc. Fuel injector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016206902A1 (en) * 2016-04-22 2017-10-26 Technische Universität Bergakademie Freiberg Device for modulating at least one liquid jet

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FR3026662A1 (en) 2016-04-08
EP3006718B1 (en) 2018-02-21

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